arch/sparc/include/asm/io_32.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/io_32.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/io_32.h
Extension
.h
Size
3430 bytes
Lines
154
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef __SPARC_IO_H
#define __SPARC_IO_H

#include <linux/kernel.h>
#include <linux/ioport.h>  /* struct resource */

#define IO_SPACE_LIMIT 0xffffffff

#define memset_io(d,c,sz)     _memset_io(d,c,sz)
#define memcpy_fromio(d,s,sz) _memcpy_fromio(d,s,sz)
#define memcpy_toio(d,s,sz)   _memcpy_toio(d,s,sz)

/*
 * Bus number may be embedded in the higher bits of the physical address.
 * This is why we have no bus number argument to ioremap().
 */
void __iomem *ioremap(phys_addr_t offset, size_t size);
void iounmap(volatile void __iomem *addr);

#include <asm-generic/io.h>

static inline void _memset_io(volatile void __iomem *dst,
                              int c, __kernel_size_t n)
{
	volatile void __iomem *d = dst;

	while (n--) {
		writeb(c, d);
		d++;
	}
}

static inline void _memcpy_fromio(void *dst, const volatile void __iomem *src,
                                  __kernel_size_t n)
{
	char *d = dst;

	while (n--) {
		char tmp = readb(src);
		*d++ = tmp;
		src++;
	}
}

static inline void _memcpy_toio(volatile void __iomem *dst, const void *src,
                                __kernel_size_t n)
{
	const char *s = src;
	volatile void __iomem *d = dst;

	while (n--) {
		char tmp = *s++;
		writeb(tmp, d);
		d++;
	}
}

/*
 * SBus accessors.
 *
 * SBus has only one, memory mapped, I/O space.
 * We do not need to flip bytes for SBus of course.
 */
static inline u8 sbus_readb(const volatile void __iomem *addr)
{
	return *(__force volatile u8 *)addr;
}

static inline u16 sbus_readw(const volatile void __iomem *addr)
{
	return *(__force volatile u16 *)addr;
}

static inline u32 sbus_readl(const volatile void __iomem *addr)
{
	return *(__force volatile u32 *)addr;
}

static inline void sbus_writeb(u8 b, volatile void __iomem *addr)
{
	*(__force volatile u8 *)addr = b;
}

static inline void sbus_writew(u16 w, volatile void __iomem *addr)
{
	*(__force volatile u16 *)addr = w;
}

static inline void sbus_writel(u32 l, volatile void __iomem *addr)
{

Annotation

Implementation Notes